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Theory of surface-potential-mediated photorefractivelike effects in liquid crystals

Theory of surface-potential-mediated photorefractivelike effects in liquid crystals
Theory of surface-potential-mediated photorefractivelike effects in liquid crystals
We make a phenomenological model of optical two-beam interaction in a model planar liquid crystal cell. The liquid crystal is subject to homeotropic anchoring at the cell walls, is surrounded by thin photosensitive layers, and is subject to a variable potential across the cell. These systems are often known as liquid crystal photorefractive systems. The interference between the two obliquely incident beams causes a time-independent periodic modulation in electric field intensity in the direction transverse to the cell normal. Our model includes this field phenomenologically by supposing an effect on the electric potential at the cell walls. The transverse periodic surface potential causes spatially periodic departures from a pure homeotropic texture. The texture modulation acts as a grating for the incident light. The incident light is both directly transmitted and also subject to diffraction. The lowest order diffracted beams correspond to energy exchange between the beams. We find that the degree of energy exchange can be strongly sensitive to the mean angle of incidence, the angle between the beams, and the imposed potential across the cell. We use the model to speculate about what factors optimize nonlinear optical interaction in liquid crystalline photorefractive systems
liquid crystals, non-linear optics, diffraction
1063-651X
011703-[15pp]
Kubytskyi, V.O
134bb85b-65ba-4d66-88e8-fbbb79986a95
Reshetnyak, V.Y.
e12aee37-8ee0-48c5-b576-c65ea3a2b3fb
Sluckin, T.J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Cox, S.J.
0e62aaed-24ad-4a74-b996-f606e40e5c55
Kubytskyi, V.O
134bb85b-65ba-4d66-88e8-fbbb79986a95
Reshetnyak, V.Y.
e12aee37-8ee0-48c5-b576-c65ea3a2b3fb
Sluckin, T.J.
8dbb6b08-7034-4ae2-aa65-6b80072202f6
Cox, S.J.
0e62aaed-24ad-4a74-b996-f606e40e5c55

Kubytskyi, V.O, Reshetnyak, V.Y., Sluckin, T.J. and Cox, S.J. (2009) Theory of surface-potential-mediated photorefractivelike effects in liquid crystals. Physical Review E, 79 (1), 011703-[15pp]. (doi:10.1103/PhysRevE.79.011703).

Record type: Article

Abstract

We make a phenomenological model of optical two-beam interaction in a model planar liquid crystal cell. The liquid crystal is subject to homeotropic anchoring at the cell walls, is surrounded by thin photosensitive layers, and is subject to a variable potential across the cell. These systems are often known as liquid crystal photorefractive systems. The interference between the two obliquely incident beams causes a time-independent periodic modulation in electric field intensity in the direction transverse to the cell normal. Our model includes this field phenomenologically by supposing an effect on the electric potential at the cell walls. The transverse periodic surface potential causes spatially periodic departures from a pure homeotropic texture. The texture modulation acts as a grating for the incident light. The incident light is both directly transmitted and also subject to diffraction. The lowest order diffracted beams correspond to energy exchange between the beams. We find that the degree of energy exchange can be strongly sensitive to the mean angle of incidence, the angle between the beams, and the imposed potential across the cell. We use the model to speculate about what factors optimize nonlinear optical interaction in liquid crystalline photorefractive systems

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More information

Published date: January 2009
Keywords: liquid crystals, non-linear optics, diffraction
Organisations: Engineering Sciences, Applied Mathematics

Identifiers

Local EPrints ID: 79825
URI: http://eprints.soton.ac.uk/id/eprint/79825
ISSN: 1063-651X
PURE UUID: 46e86210-6b59-46b1-8f55-08babb340a7b
ORCID for T.J. Sluckin: ORCID iD orcid.org/0000-0002-9163-0061

Catalogue record

Date deposited: 22 Mar 2010
Last modified: 08 Jan 2022 02:31

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Contributors

Author: V.O Kubytskyi
Author: V.Y. Reshetnyak
Author: T.J. Sluckin ORCID iD
Author: S.J. Cox

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